Bed Step Device and Method

ABSTRACT

A bed step device is provided for assisting a human or pet in climbing into and/or out of a bed. The device includes a base, at least one step attached to the base, and a retention member attached to the base. The retention member is configured to be disposed and retained between opposed surfaces of a bed, typically either the opposed surfaces of a mattress and a box spring or those of a box spring and a bed frame. The disposition of the retention member between the opposed surfaces results in a retention force, typically a friction force, to resist sliding movement of the device across a floor surface on which the device is supported. The retention member may be a rigid panel or a flexible sheet. The base and step or steps may comprise a folding staircase linkage or a rigid, unitary housing including a storage compartment.

FIELD OF THE INVENTION

The present invention relates to portable step/staircase devices forassisting a human or pet in climbing into a bed (generally referred toherein as “bed step devices”). More particularly, it relates to improvedbed step devices having improved means of preventing the devices fromsliding away from a use position adjacent to a bed.

BACKGROUND OF THE INVENTION

Many beds include tall frames, thick mattresses and/or box springs,built-in drawers or other storage space located underneath the sleepingarea, or some combination of these features. Additionally, it is commonto mount a bed frame on bed risers to increase the storage spaceavailable underneath a bed frame. While all of these adaptationsincrease the comfort and/or convenience provided by a bed, they alsotend to increase the level of the sleeping surface (generally referredto herein as the top surface of a mattress) above the floor surface onwhich the bed is supported. As a result, the bed may be too tall for itshuman user to readily sit down on the mattress from a standing positionon the floor, and/or it may be too tall for a pet to readily climb ontothe mattress from the floor. Thus, bed step devices exist, providing oneor more steps for the human or pet to climb to a position from which thehuman may comfortably sit down onto the mattress or the pet may readilyclimb onto the mattress. Human bed step devices and pet bed step devicesare analogous in purpose and function, with a practical difference beingthat human bed step devices typically do not need to be nearly as tallas pet bed step devices. This is not only because an adult human user,with rare exceptions, is taller than any common breed of pet, but alsobecause the upright stature of humans enables us to readily shift ourwhole body onto a surface by first sitting onto the surface and thenscooting backward or twisting while swinging our legs up. This processonly requires raising our hips above the level of the top of themattress, whereas our four-legged companions can only comfortably reachthe mattress by stepping onto it with all four paws, which requiresfirst raising their paws to a level from which it is comfortable forthem to step or jump onto the mattress.

In either type of bed step device, human or animal, sliding movement ofthe device on a floor surface, whether due to a transfer of horizontalmomentum from a human or pet stepping onto the device or any incidentalbumping of the device that occurs during or just before the ascent ofthe human or animal onto the device, may cause the human or animal tolose his or her balance and potentially to fall and sustain injury.Thus, it is important for safety, in addition to convenience, that thedevice remain stationary during and preceding a human's or pet's use ofthe device to climb into a bed.

Additionally, bed step devices occupy a significant amount of space.This is especially true of pet step devices, because, being generallytaller, they also must be generally longer to avoid being too steep fora pet to climb. Thus, it is desirable for a bed step device toincorporate storage space to offset the floor space occupied by thedevice.

A need therefore exists for an improved bed step device adapted toremain stationary when a user (for purposes of the present description,“user” shall refer generically to a human or other animal user) climbsonto the device and from the device onto a bed, and incorporatingstorage space.

BRIEF SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, a portable bedstep device is provided for assisting a human or pet in climbing into abed. The device comprises a base configured to be supported on agenerally horizontal floor surface, at least one step connected to thebase, and a thin, elongate retention member connected to the base. Thestep includes a generally horizontal support surface configured to beelevated above the generally horizontal floor surface when the base issupported thereon, and the thin retention member is adapted to bedisposed and retained between opposed surfaces of the bed, when thedevice is in a use position adjacent to the bed, to resist movement ofthe device away from the use position. That is to say, where a “bed” isunderstood to comprise at least two stacked together components,typically including at least a mattress and a frame, and usually alsoincluding a box spring disposed between the mattress and the frame, theretention member is adapted to be disposed and retained between opposed,contacting surfaces of two of the stacked components. Then, for example,friction forces from the opposed surfaces act on the retention member toresist pulling the retention member out from between the opposedsurfaces, to resist movement of the device away from the use position.

In one embodiment, the device further comprises a storage compartmentdisposed in the base and below the support surface.

In another embodiment, the device further comprises a linkage movablyconnecting the support surface to the base. The linkage is adapted topermit movement of the support surface to a range of positions at arange of heights above a floor surface on which the base is supported,while constraining the support surface to remain generally parallel tothe floor surface. For example, the linkage may be a folding staircase.Optionally, the linkage comprises at least two substantially parallelside links pivotally connected to the base and to the support surface,the substantially parallel side links having substantially parallel,spaced apart pivotal axes. The linkage may comprise a second supportsurface connected to the first support surface by a second linkage, thesecond linkage adapted to permit movement of the second support surfaceto a range of positions at a range of heights above the first supportsurface, while constraining the second support surface to remaingenerally parallel to the first support surface.

In still another embodiment, the retention member comprises a generallyhorizontally disposed, thin, rigid panel configured to be disposed andretained between opposed surfaces of a mattress and a box spring. Thethin rigid panel may be rigidly connected to the base or movablyconnected to the base. For example, the thin rigid panel may behorizontally slidingly connected to the base, for movement to and froman extended position and a retracted position relative to the base, andconfigured to be disposed and retained between the opposed surfaces whenin the extended position. The device is preferably generally morecompact when the thin rigid panel is in the retracted position, tofacilitate storage of the device, or use of the device not inconjunction with assisting a human or animal in climbing into a bed,with its back side against a wall, for example. Further, the device mayinclude a plurality of the thin rigid panels horizontally slidinglyconnected to the base, the plurality of thin rigid panels being spacedapart vertically from one another, to adapt the device to a range ofheights of the opposed surfaces. Alternatively, the thin rigid panel maybe vertically slidingly connected to the base for adjustment of theheight of the thin rigid panel to the height of the opposed surfaces. Instill another alternative arrangement, the thin rigid panel may bepivotally connected to the base for movement to and from a foldedstorage position and an unfolded use position for retention of the thinrigid panel between the opposed surfaces.

In yet another embodiment, the retention member comprises a flexiblesheet attached to the base. A rod may be attached to an end of theflexible sheet opposite an end of the flexible sheet connected to thebase, configured for rolling the flexible sheet onto the rod. Inaddition or alternatively, a plurality of transverse ribs may beattached to the flexible sheet in a longitudinally spaced-apartrelationship, to aid in traction. A proximal end of the flexible sheetmay be attached to the base, the flexible sheet being configured to bedisposed and retained between opposed surfaces of a box spring and a bedframe. Means for removably fastening a distal end of the flexible sheetextending from between the opposed surfaces to the base may also beincluded.

In still another embodiment, the device further comprisesfloor-contacting members (such as legs) extendably and retractablyconnected to the base to adjust the height of the base and the supportsurface relative to the generally horizontal floor surface.

In yet another embodiment, the device further comprises floor gripmembers attached to the base and configured to directly contact a floorsurface on which the base is supported, the floor grip members composedof a high-traction material to resist sliding of the grip members acrossthe floor surface.

In another aspect, the present invention provides a method of assistinga human or pet in climbing into a bed. The method comprises providing aportable bed step device comprising a base, a step having a supportsurface, and a thin, elongate retention member connected to the basesubstantially as described above. In further accordance with the method,the device is placed in a use position, wherein the base is supported ona generally horizontal floor surface adjacent the bed, and the supportsurface is elevated above the floor surface and disposed below the levelof the top of the bed, so that a user is permitted to climb from thefloor surface onto the support surface and from the support surface ontothe bed. The method further comprises disposing and retaining theretention member between opposed surfaces of the bed to resist movementof the device away from the use position.

In still another aspect, the present invention provides a method ofmaking a portable bed step device for assisting a human or pet inclimbing into a bed. The method comprises forming a base configured tobe supported on a generally horizontal floor surface, forming at leastone step fixed to the base, forming on the step a generally horizontalsupport surface configured to be elevated above the generally horizontalfloor surface when the base is supported on the generally horizontalfloor surface; and forming a thin, elongate retention member connectedto the base. The thin retention member is formed to be disposed andretained between opposed surfaces of the bed, when the device is in ause position adjacent to the bed, to resist movement of the device awayfrom the use position.

In one embodiment, the method further comprises forming a storagecompartment disposed below the support surface, as device describedabove with respect to the device of the invention. The method may stillfurther comprise mounting a sliding drawer in the storage compartment orattaching a door adjacent an opening of the storage compartment foraccess thereto. Where a door is attached, the door may be comprised in asupport surface of the step, the door being adapted to pivot open abouta horizontal axis, like the lid of a chest. This allows access to thestorage compartment without a user having to bend down far as might berequired for access to the compartment from the side.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevation view of one embodiment of a device accordingto the invention in a use position adjacent a bed.

FIG. 2 is a perspective view of an alternative embodiment of a deviceaccording to the invention.

FIG. 3 is a perspective view of another alternative device.

FIG. 4 is a side elevation view of still another alternative device in ause position.

FIG. 5 is a side elevation view of yet another alternative device in ause position.

FIG. 6 is a side elevation view of still another alternative device.

FIG. 7 is a fragmentary cross-sectional side view of a rear housingpanel and retention panel of the device depicted in FIG. 6, illustratinglocking and stop mechanisms thereof.

FIG. 8 is a side elevation view of yet another alternative device.

FIG. 9 is a perspective view of a rear mounting panel and retentionpanel of the device depicted in FIG. 8.

FIG. 10 is a side elevation view of the rear mounting panel andretention panel depicted in FIG. 9.

FIG. 11 is a side elevation view of yet another alternative device shownin a use position.

FIG. 12 is top plan view of the device depicted in FIG. 11.

FIG. 13 is a rear perspective view of the device depicted in FIG. 11,with a rear mounting panel removed.

FIG. 14 is a perspective view of a rear mounting panel of the devicedepicted in FIG. 11.

FIG. 15 is a rear elevation view of the rear mounting panel of thedevice depicted in FIG. 11.

FIG. 16 is a side elevation view of still another alternative deviceshown in a use position.

FIG. 17 is a rear perspective fragmentary view of the device depicted inFIG. 16.

FIG. 18 is an exploded perspective view of a modular embodiment of adevice according to the invention, also depicting a single-step deviceas a top component of the modular device.

FIG. 19 is a perspective view of a folding staircase embodiment of adevice according to the invention, shown in an open use position.

FIG. 20 is a side elevation view of the device depicted in FIG. 19,shown in a folded, compact, storage position.

FIG. 21 is a side elevation view of an alternative folding staircasedevice, shown in a folded position.

FIG. 22 is a perspective view of the device depicted in FIG. 21, shownin an open use position.

FIG. 23 is a perspective view of another alternative folding staircasedevice in an open use position.

FIG. 24 is a perspective view of still another alternative foldingstaircase device in an open use position.

FIG. 25 is a side elevation view of yet another alternative foldingstaircase device in a use position adjacent a bed.

DETAILED DESCRIPTION OF THE INVENTION

Improved bed step devices and methods are described in this section,with reference to the accompanying Figures. In particular, the bed stepdevices include a retention member that is configured to be retained andheld stationary relative to a bed, for example by friction forces,preferably between a mattress and a box spring. In each device, theretention member is connected to a base of the device, where “connectedto the base” means either directly connected to the base or indirectlyconnected to the base through one or more other members of the device.In some embodiments, the bed step devices include one or more storagecompartments below the steps.

Turning to FIG. 1, a bed step device 10 includes steps 12 a, 12 b, and12 c and a retention panel 14, integral to a rigid housing 16. Drawers18 a, 18 b and 18 c, having drawer pulls 19 a, 19 b and 19 c, areslidingly mounted in housing 16, as one manner of providing readilyaccessible storage space therein. Bed step device 10 is depicted in itsuse position supported on a horizontal floor surface F adjacent a bed Bhaving a tall bed frame BF, in which retention panel 14 is disposed andretained between a mattress M and a box spring X of bed B. Retentionpanel 14 is shown frictionally retained between mattress M and boxspring X of bed B. Frictional forces applied to retention panel 14 bymattress M and box spring X resist sliding movement of device 10 awayfrom the use position illustrated in FIG. 1. Preferably, retention panel14 is composed of a material having a rough surface to enhance frictionbetween retention panel 14 and the opposed contacting surfaces ofmattress M and box spring X, such as a particle wood material, forexample. Preferably, device 10 includes adjustable legs 15, suitablymounted for vertical movement into and out of leg recesses 17 in housing16, which are configured to support housing 16 on floor surface F at arange of vertical levels to align retention panel 14 with the height ofthe opposed surfaces of mattress M and box spring X for placement andretention therebetween. This height may vary considerably from one bedto another, typically depending at least in part on the height of a bedframe BF and the thickness of box spring X. Legs 15 may thread intorecesses 17 to be extended and retracted by twisting in oppositedirections, or they may slidingly engage recesses 17. In the case ofsliding engagement, an appropriate locking means such as a spring-loadedpin or set screw (not shown) may be employed to hold legs 15 in placeonce adjusted to the desired height.

Storage is most frequently depicted in the Figures as drawers, becausedrawers are easily shown in the side elevation views that lendthemselves to illustrating the function of retention panels according tothe invention. However, as alternatives to drawers, any other suitabletype of storage structure within housing 16 is also within the scope ofthe invention, including, for example, cubby holes, shelving, andcarousels/Lazy Susans (not shown), in any suitable combination. Thestorage space may be open from the side or covered in some other waythan by drawers 18 a-18 c. For example, an alternative bed step device20 includes a housing 16′ with a rigidly attached retention panel 14′and one or more pivotally attached chest lids 22 a-22 c that double asthe stepping surfaces of steps 24 a-24 c as illustrated in FIG. 2. Oneadvantage of chest-style storage space that opens from the top via lids22 a-22 c, as opposed to storage space that opens from the side, is thatone need not bend down as far to access and/or look inside the storagespace. In another alternative bed step device 26, a housing 16″ includessteps 12 a″-12 c″, an attached retention panel 14″, and pivotallymounted cabinet doors 26 a-26 c with handles 27 a-27 c on the side of ahousing 16″, as illustrated in FIG. 3.

Although retention panel 14, 14′, 14″ as shown in FIGS. 1-3 is attachedto housing 16, 16′, 16″ at the level of the highest step 12 c, 22 c, 12c″, a retention panel may be attached higher or lower as desired. Forexample, as depicted in FIG. 4, a bed step device 28, having steps 30a-30 c, drawers 32 a-32 c with drawer pulls 34 a-34 c, and adjustablelegs 36 with corresponding leg recesses 38, may include a retentionpanel 40 that is supported above top step 30 c by a vertical panel 42.In this case, the vertical distance between the feet of a user standingon top step 30 c and the top of mattress M is approximately the sum ofthe thickness of mattress M and the height of vertical panel 42. Thistype of arrangement is more appropriate for a human bed step device thana pet bed step device, as a human would most readily be able to sit downonto the top of mattress M when standing on a surface located somedistance below the bottom of mattress M. How much lower the top of topstep 30 c should be than the bottom of mattress M depends in part on theheight of the individual human user, and the height of vertical panel 42should be selected accordingly.

Turning to FIG. 5, another alternative embodiment is illustrated. A bedstep device 44 includes a housing 46 having integral steps 48 a-48 c,drawers 50 a-50 c with drawer pulls 52 a-52 c, adjustable legs 54 withcorresponding leg recesses 56, and a retention panel 58 attached tohousing 46 at a location below the top surface of a top step 48 c, sothat the top surface of top step 48 c may be above the bottom ofmattress M. It will be apparent that this positioning of retention panel58 is better suited to use of bed step device 44 by a pet than by ahuman, to facilitate stepping onto, as opposed to sitting onto, mattressM.

Yet another embodiment is illustrated in FIG. 6. A bed step device 60includes a housing 62 having integral steps 64 a-64 c, slidingly mounteddrawers 66 a-66 c with drawer pulls 68 a-68 c, adjustable legs 70suitably mounted in leg recesses 72, and a plurality of extendable andretractable retention panels 74 a-74 c slidingly mounted in retentionpanel recesses 76 a-76 c in housing 62 at various levels. In conjunctionwith adjustable height legs 70, the inclusion of retractable retentionpanels 74 a-74 c at various levels permits device 60 to be adaptable toa wide range of heights of the top of a box spring. One of retentionpanels 74 a-74 c may be extended from housing 62 for insertion of theextended retention panel between a mattress and a box spring.Preferably, the adjustable height range of legs 70 provides for a rangeof fine adjustment that is at least about equal to the vertical spacingbetween pairs of adjacent retention panels 74 a-74 c, so that device 60may be adjusted for a continuous range of box spring heights.Alternatively, it may be desirable to incorporate more than three, or asfew as one, extendable and retractable retention panels in a bed stepdevice similar to device 60 illustrated in FIG. 6. One disadvantage ofincluding more than one extendable and retractable retention panel isthat each panel, when retracted, tends to impinge on the availablestorage space within the housing of a device, by imposing, for example,a shorter height limit on drawers. As illustrated in the fragmentaryenlarged view of FIG. 7, means to prevent each retention panel 74 a, 74b, 74 c from being pulled out of and separated from housing 62 must beincluded, such as a transversely protruding stop flange 78 a, 78 b, 78c, for example. Also, each retention panel 74 a-74 c preferably includesa suitable detent or other locking mechanism, such as a flexible stopmember 80 a, 80 b, 80 c shown in FIG. 7, to keep retention panel 74 a,74 b, 74 c in the extended position as retention panel 74 a, 74 b, 74 cis being inserted between a mattress and box spring. When retentionpanel 74 a, 74 b, 74 c is in the locked extended position, the lockingmechanism should be configured to be readily disengaged manually, suchas by depressing flexible stop member 80 a, 80 b, 80 c, to reinsertretention panel 74 a, 74 b, 74 c into housing 62. Alternatively, aretention panel could be configured to freely slide into a housing fromthe extended position, but this may require a user to lift up a mattresswhile inserting the retention panel under the mattress, and then set themattress down on top of the retention panel, to avoid the retentionpanel being pushed back into housing by friction or other forces fromthe mattress and box spring.

Still another embodiment of a device according to the invention isillustrated in FIG. 8, in which bed step device 82 incorporates apivotal retention panel 84 hingedly connected to a height-adjustablerear mounting panel 86. Rear mounting panel 86 includes ribs 88,depicted in FIGS. 9 and 10, for mating with complementary slots 90 in arear side of a housing 92, as shown in FIG. 8, for vertically slidinglyconnecting rear mounting panel 86 to housing 92. Thus, in accordancewith a method of using device 82, a user first slidingly adjusts the topof rear mounting panel 86 to the height of the top of a box spring andthe bottom of a mattress; locks rear mounting panel 86 at the adjustedposition relative to housing 92 by engaging a locking pin 94, forexample by twisting or releasing a locking knob 96, depicted in FIG. 8;swings pivotal retention panel 84 to a horizontal orientation; andinserts horizontally oriented pivotal retention panel 84 between themattress and box spring to frictionally retain device 82 in a useposition. Optionally, height adjustable legs 98 mounted in leg recesses100 may also be included so that a user may first adjust the height of atop step 102 to a desired position relative to the height of the top ofa mattress before performing the foregoing steps to insert pivotalretention panel 84.

Yet another embodiment of a bed step device according to the inventionis illustrated in FIGS. 11-15. A bed step device 104, shown in FIG. 11in its use position, adjacent a bed B having a mattress M, box spring Xand bed frame BF mounted on a riser R, includes a flexible retentionsheet 106 in lieu of a rigid retention panel as described in theforegoing embodiments. In accordance with this embodiment, one end ofsheet 106 is attached at a rear side of a housing 107 of device 104, andan opposite end of sheet 106 is inserted and frictionally retainedbetween a box spring X and a mattress M. For enhanced frictionalretention, retention sheet 106 may optionally include a rod 108 at itsopposite end, one or a plurality of frictional ribs similar to ribs 184depicted in FIG. 24 for a flexible retention sheet 180, in accordancewith a folding staircase embodiment described in more detail below, orany other suitable friction enhancing features or members.Advantageously, rod 108 may also be used as a spool for rolling up sheet106, for compact storage of sheet 106 when device 104 is not in use as abed step device. Housing 107 includes storage in the form of drawers 109equipped with drawer pulls 110.

Optionally, device 104 may include a rear mounting panel 111 includingsliding ribs 112 adapted for slidable connection to grooves 113 ofhousing 107 and a locking knob 114 and pin 115, similar to rear mountingpanel 86 described above with respect to another embodiment. Followingthe appropriate adjustment of legs 116 in leg recesses 117 to position atop step 118 at the desired height relative to the top of mattress M,rear mounting panel 111 may then be vertically adjusted to the height ofthe top of box spring X to engage an edge portion 119 of retention sheet106, between a vertical portion 120 and a horizontal portion 121 ofsheet 106. In this manner, sheet 106 is constrained to a right-angleorientation even in the event that device 104 moves horizontally awayfrom bed B, and any sliding horizontal displacement of device 104 awayfrom bed B requires the same amount of displacement of edge portion 119,which is resisted by the frictional retention of sheet 106 between boxspring X and mattress M. Alternatively, rear mounting panel 111 may beomitted, and device 104 may be substantially as illustrated in FIG. 13,while sliding grooves 113 may then also be omitted.

With reference to FIGS. 16 and 17, still another embodiment of a bedstep device according to the invention is depicted as bed step device122. Bed step device 122 includes a flexible retention strap 123attached at a proximal end 124 to a housing 125 and adapted to beinserted and frictionally retained between a box spring X and a bedframe BF. Flexible retention “strap” 123 is a specific example of aflexible retention “sheet” like those described above, where in thiscase the term “strap” is used to indicate a relatively narrower swath ofmaterial. Retention strap 123 need not be as wide as the flexibleretention sheets described above to achieve the same frictionalretention force, due to the typically much higher contact pressurebetween the opposed surfaces of a box spring and a bed frame, comparedto that between the opposed surfaces of a mattress and a box spring.However, although using less material for retention strap 123 is likelydesirable in most cases, the present invention does not arbitrarilylimit the width of retention strap 123. As a further safeguard againstundesired sliding of device 122 across a floor surface F, a distal end126 of retention strap 123 extending from between box spring X and bedframe BF may optionally be detachably fastened to housing 125. Forexample, a patch 127 of material at proximal end 124 may be attached tothe rear side of housing 125 to mate with a corresponding patch 128 ofmaterial at distal end 126 of retention strap 123 in a hook-and-loopfastener (e.g., such as a Velcro® fastener) type of connection. Similarto previously described embodiments, device 122 preferably includesdrawers 129 with drawer pulls 130, adjustable legs 131 withcorresponding leg recesses 132, and steps 133.

Although each of the foregoing bed step devices is illustrated asincluding a rigid, unitary housing comprising a plurality of steps, inmany cases a single step that is short enough for a human or pet toeasily step onto the step from a floor surface may also be tall enoughto effectively assist the human or pet in climbing into the bed from aposition standing on the single step, and thus a device having a singlestep would be sufficient to serve the purposes of a pet or human bedstep device according to the invention. Such a single-step embodiment isillustrated in FIG. 18 as a top compartment 138.

Moreover, it will also be appreciated that the advantage of additionaladaptability to different bed heights is provided by a modular bed stepdevice 140 as also illustrated in FIG. 18. Device 140 includes topcompartment 138 and one or more stackable lower compartments 142 ofincreasing length, each lower compartment including a step surface 144comprising the portion of its top surface that exceeds the length of thebottom surface of the subsequently higher compartment. A retention panel146 is attached to top compartment 138, and each lower compartment 142includes mating recesses 148 configured to slidingly receive legs 150 ofa subsequently higher compartment 142 or 138, which are preferablyadjustably mounted in leg recesses 151 of the subsequently highercompartment 142 or 138. Preferably, each compartment incorporates itsown storage space, which is depicted in FIG. 18 as a respective drawer152 equipped with drawer pulls 154.

Another aspect of the present invention is a folding staircase pet bedstep device, exemplary embodiments of which are illustrated in FIGS.19-25. Turning to FIGS. 19 and 20, a pet bed step device 156 is afour-bar linkage type of folding staircase, in which each step 157 ofdevice 156 is connected by parallel pairs of side links 158, 159 to thetwo nearest higher steps 157, if any, and the two nearest lower steps157, if any. This constrains all of steps 157 to remain parallel andeach pair of adjacent steps 157 to be separated by the same verticaldistance, thus mimicking the geometry of ordinary permanent staircases,with which pets tend to be familiar and comfortable from daily use.Preferably, all of steps 157 are identical in shape and include threeevenly spaced apart holes 160 on each side to receive up to three pairsof pivotal links 158, 159, so that additional steps may be readilyattached to device 156 to lengthen device 156 as desired. Device 156includes a folding retention panel 161 connected at one end by a singlepair of side links 162 to a front end of the uppermost of steps 157.FIG. 19 is an illustration of device 156 in an unfolded useconfiguration, with retention panel 161 unfolded from top step 157 andextending in a forward direction to be inserted and frictionallyretained between a mattress and box spring, while FIG. 20 is anillustration of device 156 in a compact, box-shaped, folded storageconfiguration. One skilled in the art will note that when bottom step157 is placed on a generally horizontal floor surface, device 156 may beunfolded to raise top step 157 to a plurality of different heights. Oneskilled in the art will understand that these heights range from the sumof the thicknesses of steps 157, as in the fully folded orientation seenin FIG. 20 or as in a fully opened orientation (not shown), toapproximately the length of one of links 158 times one less than thenumber of steps 157, in an orientation in which each of links 158, 159is oriented vertically, as seen in FIGS. 19, 23, 24 and 25. When topstep 157 is raised to approximately the height of the gap between amattress and box spring, retention panel 161 may then be unfolded to beinserted and frictionally retained between the mattress and box spring.When bottom step 157 is supported on a floor surface and retention panel161 is so retained, the friction and normal forces from a mattress andbox spring resisting sliding and pivotal movement of retention panel 161may be sufficient to keep device 156 stationary as a pet climbs device156. However, should additional stability be desired, a suitable lockingmechanism such as locking mechanism 163 shown in FIGS. 19-25 may beincluded to lock device 156 in a desired orientation, and/or tractiontreads 164, as illustrated in FIG. 24, may be included on a bottom sideof bottom step 157 to further resist sliding movement of bottom step 157across a floor surface.

It should be noted that any suitable linkage by which steps areconstrained to be parallel and separated by a uniform spacing is withinthe scope of the invention. As but one additional example, instead ofeach step 157 having three link attachment holes 160 and sharing a linkin common with up to four nearest neighbors (up to two above and twobelow), an alternative pet bed step device 165 may instead have steps166 with four link attachment holes 167, so that each step 166 shares atleast one link 168, 169, 170 in common with up to six nearest neighbors(up to three above and three below), as shown in FIGS. 21 and 22. Oneskilled in the art will note that increasing the number of evenly spacedlink attachment holes on a step of a given length decreases the maximumvertical spacing between adjacent steps, which is slightly larger thanthe spacing between link attachment holes. Thus, increasing the numberof attachment holes provides a staircase that is more easily climbed bya smaller pet when opened with the links in a vertical position, for anapproximately 45° staircase incline, while also providing the benefit ofgreater structural stability resulting from more interconnectivity ofthe linkage. Even more than four link attachment holes per step wouldprovide for still more link connections as desired.

Turning to FIG. 23, another embodiment of a folding staircase deviceaccording to the present invention is illustrated as pet bed step device172. Device 172 is similar to device 156 as illustrated in FIGS. 19-20,but instead of a folding retention panel, device 172 includes a linearlyextending and retracting retention panel 174, which is slidinglyreceived in a top step 176.

With reference to FIG. 24, still another embodiment of a foldingstaircase device according to the invention is illustrated as pet bedstep device 178. Device 178 is similar to devices 156 and 172 asdescribed above, while device 178 includes a flexible retention sheet180 in lieu of a rigid retention panel. Retention sheet 180 is attachedto a top step 182, and optionally includes traction ribs 184, which maybe affixed to or hemmed into retention sheet 180, and/or a spooling rod186 to facilitate rolling up retention sheet 180 for storage. Retentionsheet 180 may be inserted between a mattress and box spring either bylifting up the mattress, rolling out retention sheet 180 onto the boxspring, and lowering the mattress onto retention sheet 180, or bygrasping spooling rod 186 and pushing spooling rod 186 between themattress and box spring until retention sheet 180 is taut. In the lattercase, the relative rigidity of spooling rod 186 assures that the leadingedge of retention sheet 180 is fully and evenly extended between themattress and box spring, without the need to lift the mattress toconfirm visually that retention sheet 180 is evenly rolled out.

Turning to FIG. 25, yet another embodiment of a folding staircase deviceaccording to the invention is illustrated as pet bed step device 188.Device 188 is similar to device 172 illustrated in FIG. 23, except thatan extending and retracting retention panel 190 is slidingly received inits second highest step 192 instead of its top step 157. In this manner,device 188 is configured so that top step 157 may rest on top of amattress M while retention panel 190 is received between mattress M andbox spring X of a bed B, thus providing additional stability to device188. For greater adaptability to various heights and thicknesses ofmattress M, a flexible retention sheet similar to retention sheet 180may be substituted for retention panel 190.

While the invention has been described with respect to certain preferredembodiments, as will be appreciated by those skilled in the art, it isto be understood that the invention is capable of numerous changes,modifications and rearrangements, and such changes, modifications andrearrangements are intended to be covered by the following claims.

What is claimed is:
 1. A portable bed step device for assisting a humanor pet in climbing into a bed, comprising: a base configured to besupported on a generally horizontal floor surface; at least one stepconnected to the base, the step including a generally horizontal supportsurface configured to be elevated above the generally horizontal floorsurface when the base is supported thereon; and a thin, elongateretention member connected to the base; the thin retention memberadapted to be disposed and retained between opposed surfaces of the bed,when the device is in a use position adjacent to the bed, to resistmovement of the device away from the use position.
 2. The device ofclaim 1, further comprising a storage compartment disposed in the baseand below the support surface.
 3. The device of claim 1, furthercomprising a linkage movably connecting the support surface to the base,the linkage adapted to permit movement of the support surface to a rangeof positions at a range of heights above a floor surface on which thebase is supported, while constraining the support surface to remaingenerally parallel to the floor surface.
 4. The device of claim 3, thelinkage comprising at least two substantially parallel side linkspivotally connected to the base and to the support surface, thesubstantially parallel side links having substantially parallel, spacedapart pivotal axes.
 5. The device of claim 3, comprising a secondsupport surface connected to the first support surface by a secondlinkage, the second linkage adapted to permit movement of the secondsupport surface to a range of positions at a range of heights above thefirst support surface, while constraining the second support surface toremain generally parallel to the first support surface.
 6. The device ofclaim 1, the retention member comprising a generally horizontallydisposed, thin, rigid panel configured to be disposed and retainedbetween opposed surfaces of a mattress and a box spring.
 7. The deviceof claim 6, the thin rigid panel being horizontally slidingly connectedto the base, for movement to and from an extended position and aretracted position relative to the base, the thin rigid panel beingconfigured to be disposed and retained between the opposed surfaces whenin the extended position, and the device being generally more compactwhen the thin rigid panel is in the retracted position.
 8. The device ofclaim 7, comprising a plurality of the thin rigid panels horizontallyslidingly connected to the base, the plurality of thin rigid panelsbeing spaced apart vertically from one another.
 9. The device of claim6, the thin rigid panel being vertically slidingly connected to the basefor adjustment of the height of the thin rigid panel to the height ofthe opposed surfaces for disposing and retaining the thin rigid panelbetween the opposed surfaces.
 10. The device of claim 6, the thin rigidpanel being pivotally connected to the base for movement to and from afolded storage position and an unfolded use position for retention ofthe thin rigid panel between the opposed surfaces.
 11. The device ofclaim 1, the retention member comprising a flexible sheet attached tothe base.
 12. The device of claim 11, further comprising a rod attachedto an end of the flexible sheet opposite an end of the flexible sheetconnected to the base, configured for rolling the flexible sheet ontothe rod.
 13. The device of claim 11, further comprising a plurality oftransverse ribs attached to the flexible sheet in a longitudinallyspaced-apart relationship.
 14. The device of claim 11, a proximal end ofthe flexible sheet being attached to the base, the flexible sheet beingconfigured to be disposed and retained between opposed surfaces of a boxspring and a bed frame, further comprising means for removably fasteninga distal end of the flexible sheet extending from between the opposedsurfaces to the base.
 15. The device of claim 1, further comprisingfloor-contacting members extendably and retractably connected to thebase to adjust the height of the base and the support surface relativeto the generally horizontal floor surface.
 16. The device of claim 1further comprising floor grip members attached to the base andconfigured to directly contact a floor surface on which the base issupported, the floor grip members composed of a high-traction materialto resist sliding of the grip members across the floor surface.
 17. Amethod of assisting a human or pet in climbing into a bed, comprising:providing a portable bed step device comprising a base, at least onestep fixed to the base, the step including a generally horizontalsupport surface, and a thin, elongate retention member connected to thebase; placing the device in a use position wherein the base is supportedon a generally horizontal floor surface adjacent the bed, and thesupport surface is elevated above the floor surface and disposed belowthe level of the top of the bed, to permit a user to climb from thefloor surface onto the support surface and from the support surface ontothe bed; and disposing and retaining the retention member betweenopposed surfaces of the bed to resist movement of the device away fromthe use position.
 18. A method of making a portable bed step device forassisting a human or pet in climbing into a bed, comprising: forming abase configured to be supported on a generally horizontal floor surface;forming at least one step fixed to the base; forming on the step agenerally horizontal support surface configured to be elevated above thegenerally horizontal floor surface when the base is supported on thegenerally horizontal floor surface; and forming a thin, elongateretention member connected to the base, the thin retention memberadapted to be disposed and retained between opposed surfaces of the bed,when the device is in a use position adjacent to the bed, to resistmovement of the device away from the use position.
 19. The method ofclaim 18, further comprising forming a storage compartment disposedbelow the support surface.
 20. The method of claim 19, furthercomprising mounting a sliding drawer in the storage compartment.
 21. Themethod of claim 19, further comprising attaching a door adjacent anopening of the storage compartment, the door configured to be opened foraccess to the storage compartment.
 22. The method of claim 21, the doorbeing comprised in a support surface of the at least one step, and thedoor being adapted to pivot open about a horizontal axis.